Head-block



A. RODGBRS.

Head Block.

No. 228,937. Patented June 15,1880.

.l rlnlldl MER. WASHINGYON. D C.

UNITED STATES PATENT OEErcE.

ALEXANDER RODGERS, F MUSKEGON, MICHIGAN.

HEAD-BLOCK.

SPECIFICATION forming part of Letters Patent No. 228,937, dated June 15, 1880.

Application filed December 8, 1879.

To all whom it may concern Be it known that I, ALEXANDER RoDeERs, of Muskegon, in-the county of Muskegon and State of Michigan, have invented certain new and useful Improvements in Log- Dogs for Saw-Mill Garriages, and I do hereby declare the following to be a full, clear, and cXact description ot' the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, and to letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in that class of saw-mill dogs in which the dogs have a free vertical sliding movement on the setting-jack; and the invention consists in providing` the frame in which the clogging mechanism slides with an elastic cushion, situated under the casing carrying the clogging mechanism, to relieve the latter from the shocks caused by the falling of the dogs, as hereinafter more fully set forth.

The accompanying drawing shows a perspective view of part of a logcarriage provided with my improvement.

The log-carriage and head-blocks may be of any of the various kinds now in use, no special construction or change being required to tit them for the reception of my improvement.

The setting-jack A is provided with a vertical dovetail groove, a, at one side, in which slides the similarly-shaped tongue b, projecting from the side of the case B which contains the dogs, the parts being fittedso that the case B, with the dogs and their actuating mechanism, shall have a free vertical movement upon the setting-jack, in order to allow the dogs to accommodate themselves to the log or cant without producing undue strain or binding of the setting-jack upon the bed C.

ln order to prevent the dog-case from disfguring or breaking the ange c of the jack by sudden falls, and to give both the upper and lower teeth sufficient vertical play to tix themselves in the log, a rubber cushion, d, is secured to the ange c in such a position that the dog-case shall rest upon it as it falls 5 or the cushion may be secured to the lower end ofthe case B, and rise or fall with it, producing the same effect in either way.

'Ihese simple changes in the construction of the (logging devices of saw-mill head-blocks will be productive of important results to the lumber manufacturer by reducing the cost of repairs, which is a very important item in the manufacture of lumber, as well as insuring the safety of employes when operating them.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, the following The combination, in the head-block of a saw-mill carriage, of the setting-jack A, vertically-moving dogging mechanism B, and elastic cushion d, the cushion being so placed as to relieve the apparatus from shocks caused by the falling of the dogs, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of October, 1879.

ALEXANDER RODGERS.

Witnesses DAVID MGLAUGHLIN, GEAUNGEY El. NEWELL. 

